1#ifndef __LINUX_VMPRESSURE_H
2#define __LINUX_VMPRESSURE_H
3
4#include <linux/mutex.h>
5#include <linux/list.h>
6#include <linux/workqueue.h>
7#include <linux/gfp.h>
8#include <linux/types.h>
9#include <linux/cgroup.h>
10#include <linux/eventfd.h>
11
12struct vmpressure {
13	unsigned long scanned;
14	unsigned long reclaimed;
15	/* The lock is used to keep the scanned/reclaimed above in sync. */
16	struct spinlock sr_lock;
17
18	/* The list of vmpressure_event structs. */
19	struct list_head events;
20	/* Have to grab the lock on events traversal or modifications. */
21	struct mutex events_lock;
22
23	struct work_struct work;
24};
25
26struct mem_cgroup;
27
28#ifdef CONFIG_MEMCG
29extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
30		       unsigned long scanned, unsigned long reclaimed);
31extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);
32
33extern void vmpressure_init(struct vmpressure *vmpr);
34extern void vmpressure_cleanup(struct vmpressure *vmpr);
35extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
36extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
37extern int vmpressure_register_event(struct mem_cgroup *memcg,
38				     struct eventfd_ctx *eventfd,
39				     const char *args);
40extern void vmpressure_unregister_event(struct mem_cgroup *memcg,
41					struct eventfd_ctx *eventfd);
42#else
43static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
44			      unsigned long scanned, unsigned long reclaimed) {}
45static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
46				   int prio) {}
47#endif /* CONFIG_MEMCG */
48#endif /* __LINUX_VMPRESSURE_H */
49